Use JsonLogic truthiness for all and none - #52

Summary

some and filter already evaluate iterator predicates with JsonLogic truthiness, but all and none were using Ruby's native truthiness instead.

That makes values like 0, "", and [] behave incorrectly inside all/none predicates, because Ruby treats some JsonLogic-falsy values as truthy.

This updates all and none to call .truthy? on the interpolated predicate result, matching the rest of the iterator operators.

Test

• bundle exec rake test - 299 runs, 312 assertions, 0 failures, 0 errors, 0 skips